Spring assembly



F. S. PRICE SPRING ASSEMBLY Jan. 10, 1939.

Filed April 22, 1938 2 Sheets-Sheet l F. 8. PRICE Jan. 10, 1939.

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Patented Jan. 10, 1939 PATENT OFFICE SPRING ASSEMBLY Frank S. Price, Holland, Mich., assignor to Charles Karr Company, a. corporation of Michigan Application April 22, 1938, Serial No. 203,499

2 Claims.

The invention relates to spring assemblies for mattresses or cushions, and its objects are to strengthen and generally improve the side margins of the assembly.

The invention consists mainly in forming the ends of the transverse rows of spirals of twin springs of special construction, and in various novel details of construction, as hereinafter pointed out and as illustrated in the accompanying drawings, in which Fig. 1 is a detail plan view of the improved mattress;

Fig. 2 is a detail section on the line 2-2 of Fig. 1;

Fig. 3 is a detail edge view of the spring assembly;

Fig. 4 is a perspective of a pair of marginal springs in substantially the relative positions they occupy when assembled; and

Fig. 5 is a detail elevation of the end of a transverse row, of spirals of slightly different form than as shown in Fig. 3.

As shown in Fig. 1, the spring assembly comprises a series of transverse rows, as Ill, II and I2, oi spirals, as l3, the number and length of the rows varying with the surface area of the assembly. The adjacent rows are, as usual, tied together by helicals ll, within the turns of which the end turns of the spirals are engaged; a similar helical l5 forming the binder of each end of the assembly. The ends of the several rows are, however, formed of two spirals, as [6, ll, of correspondingly less major diameter than the inner spirals.

The end turns, as I8, 20, of each of these end spirals enter and interlock with the adjacent helical, in one instance having an offset. as l9, inclosing a turn of the helical, and in the other, as l9", entering the helical laterally, extending along its bore toward its end and emerging between adjacent turns, being then oiTset outwardly a short distance, as shown at 2|, and extended to, interlocking with and terminating in the companion helical oi the row, as shown at 22. The portion to which the numeral 2| is applied in Fig. 4 is straight, and, with corresponding elements of the several rows of the spirals, constitutes the side binder of one face of the assembly. The companion end spiral is similarly formed and engaged, and, being inverted relaspirals with the helicals preventing their relative approach.

By the use at each face of the assembly of an end extension of one of the twin spirals for connecting the adjacent cross helicals, undesirable flexibility of the edge binder is avoided. Greater stiffness at the margin of the assembly than elsewhere is desirable, whether the use is as a seat or for reclining. As the stiflness of a spiral is increased by reducing the diameter of its coil, either throughout the length of the spring or by giving it the hour glass shape, the employment of a smaller gauge wire for the twin spirals than for those within the border of the assembly may be resorted to for avoiding the necessity for increasing the diameter of the transverse helicals beyond the size required for accommodating the two strands of inner adjacent spirals of contiguous rows. As three strands of a wire of given size require the use of a helical of but .075 times greater diameter than is required for enclosing two strands of the same gauge, the present invention calls for the use of wire for the twin spirals of but one gauge less than is used in the inner spirals, in order that clicking within the helicals may be avoided.

I claim as my invention:

1. A wire mattress formed of spirals arranged in transverse rows, such rows being bounded and connected by helicals engaging the end turns of contiguous spirals, an end of each row comprising a pair of spirals of reduced diameter, the end turns of each entering and interlocking with an adjacent helical. one of such ends being prolonged and forming a terminal extending across the end of the row and entering and interlocking with the companion helical of such row, the two end spirals being relatively inverted, whereby their cross extending terminals form sections of the side binders in the planes of the two faces of the assembly.

2. A wire mattress formed of spirals arranged in transverse rows, such rows being bounded and connected by helicals engaging the end turns of contiguous spirals, an end of each row comprising a pair of spirals of reduced diameter, the end turns of each entering and interlocking with the adjacent helical, one of such ends being prolonged and forming a terminal extending across the end of the row and entering and interlocking with the companion helical of such row, the two end spirals being relatively inverted, whereby their cross extending terminals form sections of the side binders in the planes of the two faces of the assembly, the end turns of the pairs of smaller spirals being interlinked and of greater diameter than the intermediate turns.

FRANK s. PRICE. 

